Git commits in Moodle 2.2.1 by Alexnader Bias

commit 423dc3b17e0ed8c9411e066c5e9d23648fc47b25
Author: Alexnader Bias <alexander.bias@uni-ulm.de>
Date:   Tue, 13 Dec 2011 13:17:43 +0800
Tag:    v2.2.1

MDL-30472 Course Making user lists sortable when lastacess field is hidden